电渣重熔过程渣池流场的数学模拟

Mathematical Modelling of Flow Field in Slag Bath During Electroslag Remelting

建立了电渣重熔体系下三维准稳态的数学模型,利用ANSYS商业软件对电渣重熔体系渣池流场进行了模拟计算,考虑了电磁力和由结晶器壁冷却引起的浮力共同作用的因素.计算结果表明,当电磁力占据主导地位时产生逆时针环流;当浮力占据主导地位时产生顺时针环流.对于本工况下,渣池的计算流速范围为0~0.12 m/s,最大值位于渣池内体系对称轴中部,计算的流场速度分布特征结果与物理模拟结果相符.并以此为基础,对一些假想工况下的情况作了模拟,考察了重熔电流、填充比和电极端部形状对重熔体系内渣池流场的影响.

A mathematical model for simulating ESR （electroslag remelting） process was developed, based on the assumption of 3-D axisyrmnetrical geometry and quasi-steady state. The commercial software ANSYS was applied to computing the flow/temperature field in ESR slag bath. Taking account of the joint action of the buoyancy resulting from mould wall being cooled and Lorentz forces, the computed results showed that when the buoyancy is predominating, the vortex turns clockwise and, when the Lorentz force is predominating, the vortex turns anti- clockwise. Under the conditions for this investigation, the computed flow velocity is in the range from 0 to 0.12 m＊s^-1 with maximum value occurring closely to the symmetric axis of slag bath. And, an shown in computation results, the characteristics of flow velocity distribution in the slag bath conforms well with the physical simulation results in earlier works. Then, the modeling and simulation under assumed operation conditions have been carried out to investigate the influence of remelting current, filling ratio and shape of electrode tip on the flow field in slag bath.